28507724 has 24 divisors (see below), whose sum is σ = 58856448. Its totient is φ = 11823120.

The previous prime is 28507697. The next prime is 28507729. The reversal of 28507724 is 42770582.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (28507729) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15554 + ... + 17289.

It is an arithmetic number, because the mean of its divisors is an integer number (2452352).

Almost surely, 2^28507724 is an apocalyptic number.

It is an amenable number.

28507724 is an abundant number, since it is smaller than the sum of its proper divisors (30348724).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28507724 is a wasteful number, since it uses less digits than its factorization.

28507724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32885 (or 32883 counting only the distinct ones).

The product of its (nonzero) digits is 31360, while the sum is 35.

The square root of 28507724 is about 5339.2624958884. The cubic root of 28507724 is about 305.4833293432.

The spelling of 28507724 in words is "twenty-eight million, five hundred seven thousand, seven hundred twenty-four".